Improvement in fan-blowers



- UNITED STATES PATENT OFFICE.

WILLIAM FARMER, OF NEI/V YORK, N. Y.

IMPROVEMENT IN FAN-BLOWERS.

YSpecification forming part of Letters Patent No. dfll 5, dated October 18, 1864.

T0 @ZZ whom it may concer-m Be it known that I, WILLIAM FARMER, of the city, county, and State of New York, have invented a new and uset'ul Improvement in Blowers and Exhausters; and I do hereby deelare that the following is a full, clear, and eX- act description of the same, reference being had to the accompanying drawings, in which- Figure l represents a side elevation of a gasexhauster constructed according to my invention. Fig. 2 represents an elevation of the same edgewise. Fig. 3 represents a side view ofthe same with onehalt'of the case removed. Fig. et represents a transverse section of the case with the wings within it, and Fig. 5 represents an inside view of halt ofthe ease with the wings removed.

My invention has reference to that class of blowers and exhausters in which the duid is put in motion by the revolution of an impeller having screw-formed wings, and its object is to improve the operation of such apparatus.

rIhe invention consists of the combination ot' a screw-formed impeller with a volute case, by whose actionV the Huid is conducted to or from the wings of the impeller in a whirl.

The apparatus represented in the accompan'ying drawings is of suitable form to be used as a gas-exhausterfor facilitating the passage of illuminatinggas from the retorts in which it is generated. Its ca se is formed ot' two halves, A A, which are connected at the center of the apparatus by ilanges and bolts. Fach halfhas the form ot' a volute scroll whose face (livergts progressively from the central plane of the apparatus and terminates at a port, l). The two halves are by preference made symmetrical, so that they ma-y be cast from onepattern. Each has a hub, c, at its center, through which the shaft m of the impeller D passes. The impeller is composed of a series ot' wings, c c c, formed in this instance out of a disk of sheet metal and secured to the shalt m. These wings are inclined to the plane of rotation ot' the im peller7 so that the wings are sections of screw-threads. The shaft passes through one ot' the hubs of the case and projects beyond it, the projecting extremity bein g tted with a belt-pulley, F, to which the driving-belt is applied.

When the machineis used as a gas-exhauster, thereceivin g-port of the case is connected with the pipe leading from the retorts and the other port with a pipe leading to the member of the gas apparatus to which the gas is to be delivered, and the gas entering the case lat one port is impelled and discharged at the other port. As the case is a volute scroll on thereceiving side ot' the impeller, the fluid is delivered to all parts of it, the area of the delivery-passage decreasing as it recedes from the receiving-port, and as the case is also a volute scroll on the delivery side of the in:- peller the fluid is received simultaneously from all parts of it, the area of the receivingpassage increasing as it approaches the deliveryport.

The use of the apparatus is not confined to gas-exhausting, as it maybe used for blowing air or as a rotary pump for moving water. Neither is it essential that both halves of the ease should be symmetrical, but one of them must be of volute form. rIhe impeller also need not be constructed of one piece of lsheet metal, but may be composed of helical or screwformed wings secured to a central hub.

Vhat I claim as my invention, and desire to secure by Letters Patent, is-

The combination of a screw-formed impeller with a volute case, substantially as set forth.

In testimony whereof- I have hereunto set my hand.

XVM. FARMER.

fitnesscs E. S. RENWIGK, W. L. BENNEM. 

